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Nonthermal electron cyclotron emission from TFTR supershot plasmas

G Taylor, C W Barnes, A Cavallo, P C Efthimion, K W Hill, H K Park, J E Stevens, S Tamor, M C Zarnstorff, S Zweben1989年Plasma Physics and Controlled FusionIF 2.2出版社

The Ohmic targets of supershot (Strachan et al., 1987) plasmas in the Tokamak Fusion Test Reactor (TFTR) are often characterized by the presence of nonthermal electron cyclotron emission (ECE) from a runaway or slideaway electron population. This nonthermal ECE decays away within the first 100-150 ms after the start of neutral beam injection (NBI) as the electron density rises and the loop voltage drops. After this usual slideaway-induced, nonthermal ECE is quenched a new nonthermal feature develops at frequencies just below both the optically thick, thermal emission of the ECE fundamental ordinary mode, and the second harmonic extraordinary mode. This paper presents an analysis of the ECE data which indicates a possible source of this nonthermal emission feature. In addition, correlation of the peak intensity of the nonthermal feature with various plasma parameters for 240 TFTR discharges from 1988 provides some insight toward identifying possible physical conditions which give rise to the feature.

日本語訳

TFTR(トカマク核融合試験炉)におけるスーパーショット(Strachan et al., 1987)プラズマのオーミック標的は、しばしば、ランナウェイまたはスライドアウェイ電子集団からの非熱的電子サイクロトロン放射(ECE)の存在によって特徴づけられる。この非熱的ECEは、中性粒子ビーム入射(NBI)開始後最初の100〜150 msの間に、電子密度が上昇しループ電圧が低下するにつれて減衰する。この通常のスライドアウェイ誘起非熱的ECEが消滅した後、ECE基本モードの光学的に厚い熱放射と第二高調波異常モードの両方の周波数よりわずかに低い周波数において、新たな非熱的特徴が発生する。本論文は、この非熱的放射特徴の可能な発生源を示すECEデータの解析を提示する。さらに、1988年からの240回のTFTR放電における非熱的特徴のピーク強度と様々なプラズマパラメータとの相関は、この特徴を生じさせる可能性のある物理的条件の特定に向けた洞察を提供する。

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tftr高精度(タイトル一致)

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Electron cyclotron emissionTFTRNonthermal electrons
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